Franks



F. S. BUCKMINSTER.

MEASURING INSTRUMENT.

APPLlcAnoN man FEB.24.1919.

Patented Dec. 2, y19.1.19.-

Z r1 Vsnar A 7" fr/7E specification.

Vnew a useful iefavao. c

S. BUcKMiN- s'r'nn, a citizen ofthe UnitedStates, re`s`i'di1agAatHa-ftfrd, in the cdifigty'pfHartfordand State of Coi'ni'ecticut,' lhave invented certain Imprvele'nts YiiiMetSafine Instrumentsfof whichl'the following 'a 'ThiI invention relatesV to A 'measuring instruments,the Qbi @it 0f the .invention being theproyision of m'eansiby which Ic'anfjrapidlyv` andeasil'yY obtain accurate adjustments. In Patent No.909,:15387 issued -`to meid anu'ary 12, l19097 and to which reference'maybe had, is shown'a measuring instrument of the same general type asthat covered vin V'the K{miie-sent case. The instrumentofsaidfllgettersf Pllt v possesses ,Certain advent are "pres ent in theon'e'coyered hereby; In the improved measuring 'irvifstrui'nent,VAhowever, Iinsure certainadvantage'snot attainable byfthat of thepatent, as I vWill more fully set `forth in the" ffolloavin'g des'criptiomr` riherein"I` W'ill 'oiitline in ydetail v'that form ofembodiment ofthe inyenti'o'n which 1 have selectedfor illustration inthe4 drawings `accompanying and fol-*mille :p-rit lof the; Piresentspecification;"this showing being primarily provided art topractise-theinvention. `-It"\'i'v1ll'befof courseclearthatl am'iiotArestricted" to such c disclosure. eral Ways ,Within the scopeoffthe'inyention defined by the claims following said descrip-V Itmay-depart therefrom in sevtion. c t

Referring tosaid drawings c I v Figure :l is a side elevation withaportion broken away, offa measuring instrument in'-V volving theinventionf f ment. Y

ableway, as by' the spring 8, fastened for example tothe rear end of thebodyv Qiand 2 loki'ngin the directionof-the arrojtfsiA `f Fig;v 5 .is across section.

Like characters refer to like parts throughout the 'severa-l lviewswhich are lon slightly different scales.` f

movable 4member 4such Aasia 'j aw,' by Ywhich a rough Vj or an' initial"adjustment of'V 'such a V movable "member canbe accomplished, Isubiti*.iF-iQ' FRANK S. y1?UGKlVII1\T.Sl.1ilE, 0F HARTFORD, CONNECTICUT. i

Specication of Letters Patent. l Application iledjebruaryxM, 15,1119.Serial-No. 278,560.

ses; tagli'y tf to enable v.those skilled infthe adjustment.

sequent to which a `final or micrometer adustlnent thereof canb'esecured. As maybe iiiferre'd7V oneof the primary aims I'have'inviewisfthe provision of effective means by which these two adjustments"of such a movablefmem'ber orequiyalent element, can be obtained..I

will be its' structure a'body and this body may stand horizontally `orvertically or at; 'an Vivtangle thereto,` this'being anfunimportantmatter. A body'such as meets my condition is that denoted'in ageneral'Way'byQ and' itis virtually in' the form of a beam or bar. Thisbodyis'imade rigid in some suitable Way with a base or foot as 3. kThebody2, 'as'willj be'understooda ypresents a convenient 'supportVforagagin'g membersuch as 'that denoted in a general Wayby,Athe'gajging member beingI slidable lupon thebody '2 practicallylongitudinallythereof. This giaging `l'member may function vin' anydesirable Waygasan'- 1'llustrat1`on,' itmight be theequivalent of theVmovable or adjustable'v jawfjo'f 'my patent.

Patented Dec. 2, 1919.

Y A clear, thedevice comprises in j :lot

The body 2 has on `one of its `side ,faces a scale'as practically afterthe Yfashion illustrated fin 'Seidl-Letters'. Paten-t,VVthe""graduations of this "scale 'showing what might Ibe considered'asfthe rough-or initial adjustment. The-gaging'member or block 4 slidesont'he body 2 klong'itud inail-ly thereof.

This ybod-y "Y2 AV'or its y equivalent constitutes a suitabl'esupportfor arack-bar, as @which constitutes aneifecti-'Ve means for maintainingthefgage member 4 in fposition tosecure f What Ifha-ve` referred to asthe micrometer adjustment, the gagmg'member in fact be-y ingjlocked tosuch rack 'bar after its final orfo'uter side a'longitudinal groove orchan- The body chas- 'as appelnel`7in which the'jraclf-bar'is fitted.vThe' rack-bar is normallyT maintained in itsfretracted or backwardvposition 1n .some suitfor suchfpurpose "screws asl 10 and 11 areAsho-Wn, the screws being covered;by`l the body-,"2y and etending throughlongitudinal slots as-l2 Yand lf3 adjacentthe terminals of roo , theraclr-bar 6.

not have an unusual amount of'movement; normally the screws and 1l aremidway of the respective slots. 1

It will beV understood thatv the gaging member 4 surrounds and scaled orgraduated body 2.' It will also probably be understood that the rack-bar6 extends through said gaging member.

f Tapped through the under portion of the gaging member 4 is a screw14.` 'The upper portionof the gaging member has a cavity in which isreceived the bowed spring 16 bearing at its ends against the upper wallof the cavity and between its ends against the rack bar 6. The saidgaging member 4 has between it at opposite'sides ofthe cavity v16,

, t teeth as 17, adapted to' coperate with those of the rack-bar; Thescrew 14 isassumed to be run all the way in so as to cause the teeth 17tolengage `those of the rack-bar 6 to thus hold the gaging member 4 inva fixed posi-` tion. To free' the gaging member, the screw -14 will bebacked outj'so that the spring 16,-- will cause the 'teeth 17 to befreed from those of the Vrack-bar andthus` permit the adjustment ofthegaging member .4 along the graduated body 2. When the Vgaging .memf

ber is'v in a desired position, as will be determined by the coincidenceof the rear wall ofthe opening 18 with' a'graduation of theA scale 5,1:the screw 14 will .be'run in, thus coupling Vthe gagirr'gY ymember 4,1with the rack-bar 6. This Vin fact isthe procedure which-follows therough or: initial adjustv mentofthe gaging member 4. j Y @The finalLadjustment ofthe gaging mem. 'rj ber4 issecured through the endwise orlongitudinal movement ofthe rack-bar. The

Y means for veffecting such adjustment of the rack-bar, while the gagingmember 4 is coupled thereto may as will be understood` vary, althoughthose shownfor the purpose and now to be described, meet my,conditions." in a satisfactory manner. The rackbar G hasatits forwardend the neck v19 terminating ina hub 20 practically of cylindrical vformand shown as having external threads of yrather lfine pitch to receivethreads on Vthe f'sleeve 'n or barrel v21'lwhichy `surrounds the sameand which eXtends as i .f shown somewhat-beyondthe ends of the. hub orhead 20;. The inner end of this sleeve 21v fits and turnsin the chamber2 2 inthe bar 2 at theforward end of the v graduated body 2. i' Thesleeve or barrel 21 is lshown as; surrounded bythe tubularl .Y ,clampingor manipulating member .23', held` V(i0y in `clamping engagement j withthe sleeve or barrel. by thepin or screw `24,-the inner edge of saidmanipulating or clamping," member having asubstantial bearing againstthefront end of the body 2. This clamping b or manipulating'member hasat 'its inner The slots 12 and 13 areV lcomparatively short as thevrack-bar does Y slides onA the Y tion with the racklbar.

portion the circumferential scale 25 coperative with afzero mark 26onthe adjacent end of the'body 2.v vl \lormally,"thefz'ero mark of thescale-25 is opposite the zerov Vmark 26, asshown for instance, in Fig.l.

.f It will be assumedrfthat :itis desiredV to adjust the gaging'memberor block 4.V InV vthis event, the following action will take place: Thescrew 14 will first be backed out thus freeing the gagingmembersoj'that; it can be moved longitudinally along the body 2 andlikewisewith respectto the rack-bar 6, then held in its retractedposition bythe Y spring 8. When said gage'membe'r has'been adjusted tothe desired and lap)proximate position, which isindicated by the scaleV5,

the inal adjustment is broughtl abo'utfthe;` screw V14 being manipulatedso that the gage ,f

member will beV brought intocoupled vrela-V After thisisdone theadjusting or manipulating thimblel'23 is turned, thusV turning thesleeve or barrel 21,

either forwardly orf ba'clrwardly depending ofcourse upon the directionwhich the thimble 26 is turned.l lWhen thisl is done and as aconsequence, moving .the rack-bar` the gaging member 4 is lockedsubstantially l Yinto firm mesh'f Y as well as certain other parts fromexposure, Y .7 1

and vfor this purpose I'v show a ,barrieror' guard member 27, whichconsists of a channeled strip embracing the body 2.practically.

for its complete length vand also overlying-Y ,Y thegage member 4.l'l`hisg'uard ,member` or'barrier 27'V is held in place bythel SQIeWs n10 and 11,'which, itlwillbe rememberedareYAY utilized toflimittheposition ofthe,rack-Y .bareyif Y Y Y I' 'f Aslshown thebodyl '2 l'the rack have zero lmarks Lat the rightl orouterlends i 'these marksregister as shown, this indicates position.

Y What I claimis: Y

Vthereof vras illustrated'.l in Fig. 1. YWhen Y' 1`. A. measuringinstrument comprising a Y body,a gage member associated kwithsaid bodyfor adjustment there-along: a 4bar sup vported by the body,v a springfastened to the .rear end of the body,Y the bar havingl anotchat'itsiback end to receive fthe free portion of the spring,thelatter'tending lconstantly to retract said bar, Vfixed Apins on thebody, the 'bar having longitudinal slots to receive said pins, means foradvanc'i theban@ j .7.2. A, measuring instrument comprising a body, jalgaging memberV associated-with saidV means for coupling the gagingmember to Y ody .for Vadjustment `therealong, a rack-barY supported thebody and having Va,

Y' ing the pins longitudinallyofthe body, and Y threaded forward end,means forv coupling Intestimony whereof I aiX my signature the gagingmember with the rack-bar, a in the presence of two witnesses. sleeve inthreaded engagement with said threaded end, and a divided manipulatingFRANK BUCKMINSTER' 5 portion in clamping engagement with the Witnesses:i V sleeve and abutting against a iXed part of GERTRUDE C. NITKIN,

the body. HEATH SUTHERLAND.

